Clock



FIG. 1 is a left front perspective view of a clock showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is an enlarged cross-sectional view thereof as taken from line 7--7 of FIG. 2. 

The ornamental design for a clock, substantially as shown and described. 